HEAT OF FUSION CALCULATIONS FEBRUARY 24, 2015. SCIENCE STARTER DO THE SCIENCE STARTER TAKE 3 MINUTES YOU ARE SEATED AND SILENT.

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Presentation transcript:

HEAT OF FUSION CALCULATIONS FEBRUARY 24, 2015

SCIENCE STARTER DO THE SCIENCE STARTER TAKE 3 MINUTES YOU ARE SEATED AND SILENT

AIM Can the heat of fusion formula be utilized to calculate the amount of heat required when heating water from 40˚C to 60˚C?

SCIENCE STARTER REVIEW 1. At which temperature is the vapor pressure of ethanol equal to the vapor pressure of propanone at 35ºC a)35ºC b)60ºC c)82ºC d)95ºC

2. At which temperature is the vapor pressure of ethanol equal to 80kPa a)48ºC b)73ºC c)80ºC d)101ºC

3. Which sample has the highest vapor pressure? a)Water at 20ºC b)Water at 80ºC c)Ethanol at 50ºC d)Ethanol at 65ºC

4. Which temperatures represent, respectively, the normal freezing point and the normal boiling point of water? a)0K and 273K b)0K and 100K c)100K and 273K d)273K and 373K

5. At standard pressure, the steam-water equilibrium temperature occurs at a)0K b)100K c)273K d)373K

1. What is total number of joules released when a 5.00 gram sample of water changes from liquid to solid at 0ºC?

2. What is the minimum amount of heat required to completely melt 20.0 grams of ice at its melting point?

3. The heat of fusion of water is 80 calories per gram. How many calories of heat would be required to completely melt 5 grams of H 2 O(s) at 0ºC toH 2 O(l) at 0ºC?

SUMMARY You were also introduced to heat of fusion calculations

INDEPENDENT WORK LOG ONTO Go to Weekly Assignment Go to Week of Feb 23 – 27 ▫What you need to complete this week  Reading and questions  Vocabulary  Notecard  Homework  Project  AIM PROMPT – must complete each day